The Pentair Control Board (475975) is the OEM replacement control board for the Pentair ETi® 400 Heater, restoring full electronic management of ignition sequencing, temperature regulation, and system fault monitoring. ⚠️ IMPORTANT: LICENSED PROFESSIONAL INSTALLATION REQUIRED Gas and electrical heater components must be serviced by a licensed pool professional or qualified HVAC technician. Do not attempt to service gas or high-voltage components without proper certification. The control board is the central processing unit of the ETi® 400 Heater, managing burner ignition, temperature setpoint control, high-limit protection, and diagnostic fault codes. When the control board fails, the heater may not ignite, may display error codes, or may shut down unexpectedly. Replacing the board with the correct OEM part restores factory-programmed logic and ensures all safety interlocks operate as designed. Specifications Pentair Part Number 475975 Part Name Control Board Quantity Included Each (1) Fits Into Brand Equipment Line Model / Part Number Notes Pentair ETi® 400 Heater — ETi Series ETi400 — Compatibility is based on Pentair parts documentation and available OEM records. This is not an exhaustive list. For certainty, verify the part number in your equipment's manual or on the original part itself before ordering. Pro Tip Before ordering, locate the part number printed on your existing control board and confirm it matches 475975. Control board variants can differ by heater revision, and installing an incorrect board may prevent the heater from operating or may disable safety interlocks. If your heater is displaying a fault code, consult the ETi® 400 service manual to confirm the control board is the diagnosed failed component before replacing it — a licensed technician should perform this diagnosis and the replacement.
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